Water-laid felt, wool fiber



' Patented Feb. 10, 1931' UNITED, STATES PATENT OFFICE HENRY PHILIPSHOPNEGK, F DORGEESTEB, MASSACHUSETTS, ASSIGTIOB, BY MESNE ASSIGNMENTS,T0 ARDEN BOX TOE COMPANY, OF WATERTOWII, MASSACHUSETTS, A

CORPORATION OF MASSACHUSETTS WATER-LAID FELT, WOOL No Drawing.

In my prior Patent, No. 1,57 4,126, granted February 23, 1926, Idisclosed a water-laid felt consisting of a short-fibered base, such aswood pulp, and relatively longer vegetable fibers of ligno-cellulosicorigin distributed throughout the base in felted relation-therewith.

I havenow discovered that I may substitute for the long vegetable fibersof my said prior patent certain other long fibers not ofligno-cellulosic origin, such as wool fibers, or a mixture of wool andcotton fibers. These fibers are obtained from usual sources.

Preferably, I use long fibered shredded textile rags, clippings, "or newcuttings. By the term textile ragsF-I mean cotton rags containing moreor less wool, and wool rags substantially free from or containing only asmall percentage of cotton.

The long wool or Wool and cotton fibers are mixed with the short fiberedbase and the mass is felted out, preferably on a cylinder feltingmachine, and afterwards impregnated with a'binder, as a thermo-plasticbinder, 25 a characteristic mix consistingv of approximately 60% shortfibered stock, and 40% long fibers of the class described.

Under some circumstances, I may use min eral fibers (such as asbestos),a characteristic mix consisting of approximately 60% short fiberedstock,long fibers of the class described, and 10% asbestos or other mineralfibers. The asbestos fiber, being non-combustible, diminishes thecombustibility of the.

finished product, while. at the same time serves as the short-fibered orlong-fibered component, depending upon the kind of asbestos fiber used.

It is to be noted that in the two examples given the felt consists of apreponderant proportionof short-fibered stock and a subordinateproportion of long-fibered stock. When these stocks are used insubstantial proportions in the examples, namely 60%. short-fibered stockand 40% long-fibered stock, it is possible to produce a product 1926.Serial No. 119,479.

fibers. Such a product is an excellent base or foundation material forimpregnation with thermo-plastic binder in the production of box toematerial which is capable of being softened by heat to permit a box toeblank cut I therefrom to conform to the shape of the last, ashereinafter claimed.

Various other modifications in materials and proportions may obviouslybe resorted to all without departing from the spirit of my in'vention,ifwithin the limits of the appended claims.

What I therefore claim and desire to secure by Letters Patent is v1. Awater-laid felt consisting only of a short fibered base and much longerwool and cotton fibers and asbestos fibers distributed therethrough infelted relation therewith, the proportions of the mix beingsubstantially as follows: short fibered base wool and cotton fibers 30%and asbestos fibers 10%. 2. A water-laid felt consisting of ashortfibered base and much longer wool and cotton fibers and asbestosfibers distributed therethrough in felted relation therewith.

In testimony whereof I aifix my signature.

HENRY PHILIP SHOPNECK.

